Loading...
1/*
2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
3 *
4 * Copyright (C) 2006 IBM Corporation
5 *
6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 */
23
24#include <linux/scatterlist.h>
25#include <linux/slab.h>
26
27#include <scsi/sas_ata.h>
28#include "sas_internal.h"
29#include <scsi/scsi_host.h>
30#include <scsi/scsi_device.h>
31#include <scsi/scsi_tcq.h>
32#include <scsi/scsi.h>
33#include <scsi/scsi_transport.h>
34#include <scsi/scsi_transport_sas.h>
35#include "../scsi_sas_internal.h"
36#include "../scsi_transport_api.h"
37#include <scsi/scsi_eh.h>
38
39static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
40{
41 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
42
43 /* transport error */
44 if (ts->resp == SAS_TASK_UNDELIVERED)
45 return AC_ERR_ATA_BUS;
46
47 /* ts->resp == SAS_TASK_COMPLETE */
48 /* task delivered, what happened afterwards? */
49 switch (ts->stat) {
50 case SAS_DEV_NO_RESPONSE:
51 return AC_ERR_TIMEOUT;
52
53 case SAS_INTERRUPTED:
54 case SAS_PHY_DOWN:
55 case SAS_NAK_R_ERR:
56 return AC_ERR_ATA_BUS;
57
58
59 case SAS_DATA_UNDERRUN:
60 /*
61 * Some programs that use the taskfile interface
62 * (smartctl in particular) can cause underrun
63 * problems. Ignore these errors, perhaps at our
64 * peril.
65 */
66 return 0;
67
68 case SAS_DATA_OVERRUN:
69 case SAS_QUEUE_FULL:
70 case SAS_DEVICE_UNKNOWN:
71 case SAS_SG_ERR:
72 return AC_ERR_INVALID;
73
74 case SAS_OPEN_TO:
75 case SAS_OPEN_REJECT:
76 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
77 __func__, ts->stat);
78 return AC_ERR_OTHER;
79
80 case SAM_STAT_CHECK_CONDITION:
81 case SAS_ABORTED_TASK:
82 return AC_ERR_DEV;
83
84 case SAS_PROTO_RESPONSE:
85 /* This means the ending_fis has the error
86 * value; return 0 here to collect it */
87 return 0;
88 default:
89 return 0;
90 }
91}
92
93static void sas_ata_task_done(struct sas_task *task)
94{
95 struct ata_queued_cmd *qc = task->uldd_task;
96 struct domain_device *dev;
97 struct task_status_struct *stat = &task->task_status;
98 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
99 struct sas_ha_struct *sas_ha;
100 enum ata_completion_errors ac;
101 unsigned long flags;
102 struct ata_link *link;
103
104 if (!qc)
105 goto qc_already_gone;
106
107 dev = qc->ap->private_data;
108 sas_ha = dev->port->ha;
109 link = &dev->sata_dev.ap->link;
110
111 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
112 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
113 ((stat->stat == SAM_STAT_CHECK_CONDITION &&
114 dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
115 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
116
117 if (!link->sactive) {
118 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
119 } else {
120 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.tf.command);
121 if (unlikely(link->eh_info.err_mask))
122 qc->flags |= ATA_QCFLAG_FAILED;
123 }
124
125 dev->sata_dev.sstatus = resp->sstatus;
126 dev->sata_dev.serror = resp->serror;
127 dev->sata_dev.scontrol = resp->scontrol;
128 } else {
129 ac = sas_to_ata_err(stat);
130 if (ac) {
131 SAS_DPRINTK("%s: SAS error %x\n", __func__,
132 stat->stat);
133 /* We saw a SAS error. Send a vague error. */
134 if (!link->sactive) {
135 qc->err_mask = ac;
136 } else {
137 link->eh_info.err_mask |= AC_ERR_DEV;
138 qc->flags |= ATA_QCFLAG_FAILED;
139 }
140
141 dev->sata_dev.tf.feature = 0x04; /* status err */
142 dev->sata_dev.tf.command = ATA_ERR;
143 }
144 }
145
146 qc->lldd_task = NULL;
147 if (qc->scsicmd)
148 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
149 ata_qc_complete(qc);
150 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
151
152 /*
153 * If the sas_task has an ata qc, a scsi_cmnd and the aborted
154 * flag is set, then we must have come in via the libsas EH
155 * functions. When we exit this function, we need to put the
156 * scsi_cmnd on the list of finished errors. The ata_qc_complete
157 * call cleans up the libata side of things but we're protected
158 * from the scsi_cmnd going away because the scsi_cmnd is owned
159 * by the EH, making libata's call to scsi_done a NOP.
160 */
161 spin_lock_irqsave(&task->task_state_lock, flags);
162 if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
163 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
164 spin_unlock_irqrestore(&task->task_state_lock, flags);
165
166qc_already_gone:
167 list_del_init(&task->list);
168 sas_free_task(task);
169}
170
171static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
172{
173 int res;
174 struct sas_task *task;
175 struct domain_device *dev = qc->ap->private_data;
176 struct sas_ha_struct *sas_ha = dev->port->ha;
177 struct Scsi_Host *host = sas_ha->core.shost;
178 struct sas_internal *i = to_sas_internal(host->transportt);
179 struct scatterlist *sg;
180 unsigned int xfer = 0;
181 unsigned int si;
182
183 /* If the device fell off, no sense in issuing commands */
184 if (dev->gone)
185 return AC_ERR_SYSTEM;
186
187 task = sas_alloc_task(GFP_ATOMIC);
188 if (!task)
189 return AC_ERR_SYSTEM;
190 task->dev = dev;
191 task->task_proto = SAS_PROTOCOL_STP;
192 task->task_done = sas_ata_task_done;
193
194 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
195 qc->tf.command == ATA_CMD_FPDMA_READ) {
196 /* Need to zero out the tag libata assigned us */
197 qc->tf.nsect = 0;
198 }
199
200 ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
201 task->uldd_task = qc;
202 if (ata_is_atapi(qc->tf.protocol)) {
203 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
204 task->total_xfer_len = qc->nbytes;
205 task->num_scatter = qc->n_elem;
206 } else {
207 for_each_sg(qc->sg, sg, qc->n_elem, si)
208 xfer += sg->length;
209
210 task->total_xfer_len = xfer;
211 task->num_scatter = si;
212 }
213
214 task->data_dir = qc->dma_dir;
215 task->scatter = qc->sg;
216 task->ata_task.retry_count = 1;
217 task->task_state_flags = SAS_TASK_STATE_PENDING;
218 qc->lldd_task = task;
219
220 switch (qc->tf.protocol) {
221 case ATA_PROT_NCQ:
222 task->ata_task.use_ncq = 1;
223 /* fall through */
224 case ATAPI_PROT_DMA:
225 case ATA_PROT_DMA:
226 task->ata_task.dma_xfer = 1;
227 break;
228 }
229
230 if (qc->scsicmd)
231 ASSIGN_SAS_TASK(qc->scsicmd, task);
232
233 if (sas_ha->lldd_max_execute_num < 2)
234 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
235 else
236 res = sas_queue_up(task);
237
238 /* Examine */
239 if (res) {
240 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
241
242 if (qc->scsicmd)
243 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
244 sas_free_task(task);
245 return AC_ERR_SYSTEM;
246 }
247
248 return 0;
249}
250
251static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
252{
253 struct domain_device *dev = qc->ap->private_data;
254
255 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
256 return true;
257}
258
259static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
260 unsigned long deadline)
261{
262 struct ata_port *ap = link->ap;
263 struct domain_device *dev = ap->private_data;
264 struct sas_internal *i =
265 to_sas_internal(dev->port->ha->core.shost->transportt);
266 int res = TMF_RESP_FUNC_FAILED;
267 int ret = 0;
268
269 if (i->dft->lldd_I_T_nexus_reset)
270 res = i->dft->lldd_I_T_nexus_reset(dev);
271
272 if (res != TMF_RESP_FUNC_COMPLETE) {
273 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
274 ret = -EAGAIN;
275 }
276
277 switch (dev->sata_dev.command_set) {
278 case ATA_COMMAND_SET:
279 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
280 *class = ATA_DEV_ATA;
281 break;
282 case ATAPI_COMMAND_SET:
283 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
284 *class = ATA_DEV_ATAPI;
285 break;
286 default:
287 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
288 __func__,
289 dev->sata_dev.command_set);
290 *class = ATA_DEV_UNKNOWN;
291 break;
292 }
293
294 ap->cbl = ATA_CBL_SATA;
295 return ret;
296}
297
298static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
299 unsigned long deadline)
300{
301 struct ata_port *ap = link->ap;
302 struct domain_device *dev = ap->private_data;
303 struct sas_internal *i =
304 to_sas_internal(dev->port->ha->core.shost->transportt);
305 int res = TMF_RESP_FUNC_FAILED;
306 int ret = 0;
307
308 if (i->dft->lldd_ata_soft_reset)
309 res = i->dft->lldd_ata_soft_reset(dev);
310
311 if (res != TMF_RESP_FUNC_COMPLETE) {
312 SAS_DPRINTK("%s: Unable to soft reset\n", __func__);
313 ret = -EAGAIN;
314 }
315
316 switch (dev->sata_dev.command_set) {
317 case ATA_COMMAND_SET:
318 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
319 *class = ATA_DEV_ATA;
320 break;
321 case ATAPI_COMMAND_SET:
322 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
323 *class = ATA_DEV_ATAPI;
324 break;
325 default:
326 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
327 __func__, dev->sata_dev.command_set);
328 *class = ATA_DEV_UNKNOWN;
329 break;
330 }
331
332 ap->cbl = ATA_CBL_SATA;
333 return ret;
334}
335
336static void sas_ata_post_internal(struct ata_queued_cmd *qc)
337{
338 if (qc->flags & ATA_QCFLAG_FAILED)
339 qc->err_mask |= AC_ERR_OTHER;
340
341 if (qc->err_mask) {
342 /*
343 * Find the sas_task and kill it. By this point,
344 * libata has decided to kill the qc, so we needn't
345 * bother with sas_ata_task_done. But we still
346 * ought to abort the task.
347 */
348 struct sas_task *task = qc->lldd_task;
349 unsigned long flags;
350
351 qc->lldd_task = NULL;
352 if (task) {
353 /* Should this be a AT(API) device reset? */
354 spin_lock_irqsave(&task->task_state_lock, flags);
355 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
356 spin_unlock_irqrestore(&task->task_state_lock, flags);
357
358 task->uldd_task = NULL;
359 __sas_task_abort(task);
360 }
361 }
362}
363
364static struct ata_port_operations sas_sata_ops = {
365 .prereset = ata_std_prereset,
366 .softreset = sas_ata_soft_reset,
367 .hardreset = sas_ata_hard_reset,
368 .postreset = ata_std_postreset,
369 .error_handler = ata_std_error_handler,
370 .post_internal_cmd = sas_ata_post_internal,
371 .qc_defer = ata_std_qc_defer,
372 .qc_prep = ata_noop_qc_prep,
373 .qc_issue = sas_ata_qc_issue,
374 .qc_fill_rtf = sas_ata_qc_fill_rtf,
375 .port_start = ata_sas_port_start,
376 .port_stop = ata_sas_port_stop,
377};
378
379static struct ata_port_info sata_port_info = {
380 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
381 .pio_mask = ATA_PIO4,
382 .mwdma_mask = ATA_MWDMA2,
383 .udma_mask = ATA_UDMA6,
384 .port_ops = &sas_sata_ops
385};
386
387int sas_ata_init_host_and_port(struct domain_device *found_dev,
388 struct scsi_target *starget)
389{
390 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
391 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
392 struct ata_port *ap;
393
394 ata_host_init(&found_dev->sata_dev.ata_host,
395 ha->dev,
396 sata_port_info.flags,
397 &sas_sata_ops);
398 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
399 &sata_port_info,
400 shost);
401 if (!ap) {
402 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
403 return -ENODEV;
404 }
405
406 ap->private_data = found_dev;
407 ap->cbl = ATA_CBL_SATA;
408 ap->scsi_host = shost;
409 found_dev->sata_dev.ap = ap;
410
411 return 0;
412}
413
414void sas_ata_task_abort(struct sas_task *task)
415{
416 struct ata_queued_cmd *qc = task->uldd_task;
417 struct completion *waiting;
418
419 /* Bounce SCSI-initiated commands to the SCSI EH */
420 if (qc->scsicmd) {
421 struct request_queue *q = qc->scsicmd->device->request_queue;
422 unsigned long flags;
423
424 spin_lock_irqsave(q->queue_lock, flags);
425 blk_abort_request(qc->scsicmd->request);
426 spin_unlock_irqrestore(q->queue_lock, flags);
427 scsi_schedule_eh(qc->scsicmd->device->host);
428 return;
429 }
430
431 /* Internal command, fake a timeout and complete. */
432 qc->flags &= ~ATA_QCFLAG_ACTIVE;
433 qc->flags |= ATA_QCFLAG_FAILED;
434 qc->err_mask |= AC_ERR_TIMEOUT;
435 waiting = qc->private_data;
436 complete(waiting);
437}
438
439static void sas_task_timedout(unsigned long _task)
440{
441 struct sas_task *task = (void *) _task;
442 unsigned long flags;
443
444 spin_lock_irqsave(&task->task_state_lock, flags);
445 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
446 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
447 spin_unlock_irqrestore(&task->task_state_lock, flags);
448
449 complete(&task->completion);
450}
451
452static void sas_disc_task_done(struct sas_task *task)
453{
454 if (!del_timer(&task->timer))
455 return;
456 complete(&task->completion);
457}
458
459#define SAS_DEV_TIMEOUT 10
460
461/**
462 * sas_execute_task -- Basic task processing for discovery
463 * @task: the task to be executed
464 * @buffer: pointer to buffer to do I/O
465 * @size: size of @buffer
466 * @dma_dir: DMA direction. DMA_xxx
467 */
468static int sas_execute_task(struct sas_task *task, void *buffer, int size,
469 enum dma_data_direction dma_dir)
470{
471 int res = 0;
472 struct scatterlist *scatter = NULL;
473 struct task_status_struct *ts = &task->task_status;
474 int num_scatter = 0;
475 int retries = 0;
476 struct sas_internal *i =
477 to_sas_internal(task->dev->port->ha->core.shost->transportt);
478
479 if (dma_dir != DMA_NONE) {
480 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
481 if (!scatter)
482 goto out;
483
484 sg_init_one(scatter, buffer, size);
485 num_scatter = 1;
486 }
487
488 task->task_proto = task->dev->tproto;
489 task->scatter = scatter;
490 task->num_scatter = num_scatter;
491 task->total_xfer_len = size;
492 task->data_dir = dma_dir;
493 task->task_done = sas_disc_task_done;
494 if (dma_dir != DMA_NONE &&
495 sas_protocol_ata(task->task_proto)) {
496 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
497 task->scatter,
498 task->num_scatter,
499 task->data_dir);
500 }
501
502 for (retries = 0; retries < 5; retries++) {
503 task->task_state_flags = SAS_TASK_STATE_PENDING;
504 init_completion(&task->completion);
505
506 task->timer.data = (unsigned long) task;
507 task->timer.function = sas_task_timedout;
508 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
509 add_timer(&task->timer);
510
511 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
512 if (res) {
513 del_timer(&task->timer);
514 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
515 res);
516 goto ex_err;
517 }
518 wait_for_completion(&task->completion);
519 res = -ECOMM;
520 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
521 int res2;
522 SAS_DPRINTK("task aborted, flags:0x%x\n",
523 task->task_state_flags);
524 res2 = i->dft->lldd_abort_task(task);
525 SAS_DPRINTK("came back from abort task\n");
526 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
527 if (res2 == TMF_RESP_FUNC_COMPLETE)
528 continue; /* Retry the task */
529 else
530 goto ex_err;
531 }
532 }
533 if (task->task_status.stat == SAM_STAT_BUSY ||
534 task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
535 task->task_status.stat == SAS_QUEUE_FULL) {
536 SAS_DPRINTK("task: q busy, sleeping...\n");
537 schedule_timeout_interruptible(HZ);
538 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
539 struct scsi_sense_hdr shdr;
540
541 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
542 &shdr)) {
543 SAS_DPRINTK("couldn't normalize sense\n");
544 continue;
545 }
546 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
547 (shdr.sense_key == 2 && shdr.asc == 4 &&
548 shdr.ascq == 1)) {
549 SAS_DPRINTK("device %016llx LUN: %016llx "
550 "powering up or not ready yet, "
551 "sleeping...\n",
552 SAS_ADDR(task->dev->sas_addr),
553 SAS_ADDR(task->ssp_task.LUN));
554
555 schedule_timeout_interruptible(5*HZ);
556 } else if (shdr.sense_key == 1) {
557 res = 0;
558 break;
559 } else if (shdr.sense_key == 5) {
560 break;
561 } else {
562 SAS_DPRINTK("dev %016llx LUN: %016llx "
563 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
564 "\n",
565 SAS_ADDR(task->dev->sas_addr),
566 SAS_ADDR(task->ssp_task.LUN),
567 shdr.sense_key,
568 shdr.asc, shdr.ascq);
569 }
570 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
571 task->task_status.stat != SAM_STAT_GOOD) {
572 SAS_DPRINTK("task finished with resp:0x%x, "
573 "stat:0x%x\n",
574 task->task_status.resp,
575 task->task_status.stat);
576 goto ex_err;
577 } else {
578 res = 0;
579 break;
580 }
581 }
582ex_err:
583 if (dma_dir != DMA_NONE) {
584 if (sas_protocol_ata(task->task_proto))
585 dma_unmap_sg(task->dev->port->ha->dev,
586 task->scatter, task->num_scatter,
587 task->data_dir);
588 kfree(scatter);
589 }
590out:
591 return res;
592}
593
594/* ---------- SATA ---------- */
595
596static void sas_get_ata_command_set(struct domain_device *dev)
597{
598 struct dev_to_host_fis *fis =
599 (struct dev_to_host_fis *) dev->frame_rcvd;
600
601 if ((fis->sector_count == 1 && /* ATA */
602 fis->lbal == 1 &&
603 fis->lbam == 0 &&
604 fis->lbah == 0 &&
605 fis->device == 0)
606 ||
607 (fis->sector_count == 0 && /* CE-ATA (mATA) */
608 fis->lbal == 0 &&
609 fis->lbam == 0xCE &&
610 fis->lbah == 0xAA &&
611 (fis->device & ~0x10) == 0))
612
613 dev->sata_dev.command_set = ATA_COMMAND_SET;
614
615 else if ((fis->interrupt_reason == 1 && /* ATAPI */
616 fis->lbal == 1 &&
617 fis->byte_count_low == 0x14 &&
618 fis->byte_count_high == 0xEB &&
619 (fis->device & ~0x10) == 0))
620
621 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
622
623 else if ((fis->sector_count == 1 && /* SEMB */
624 fis->lbal == 1 &&
625 fis->lbam == 0x3C &&
626 fis->lbah == 0xC3 &&
627 fis->device == 0)
628 ||
629 (fis->interrupt_reason == 1 && /* SATA PM */
630 fis->lbal == 1 &&
631 fis->byte_count_low == 0x69 &&
632 fis->byte_count_high == 0x96 &&
633 (fis->device & ~0x10) == 0))
634
635 /* Treat it as a superset? */
636 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
637}
638
639/**
640 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
641 * @dev: the device to send the command to
642 * @command: the command register
643 * @features: the features register
644 * @buffer: pointer to buffer to do I/O
645 * @size: size of @buffer
646 * @dma_dir: DMA direction. DMA_xxx
647 */
648static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
649 u8 features, void *buffer, int size,
650 enum dma_data_direction dma_dir)
651{
652 int res = 0;
653 struct sas_task *task;
654 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
655 &dev->frame_rcvd[0];
656
657 res = -ENOMEM;
658 task = sas_alloc_task(GFP_KERNEL);
659 if (!task)
660 goto out;
661
662 task->dev = dev;
663
664 task->ata_task.fis.fis_type = 0x27;
665 task->ata_task.fis.command = command;
666 task->ata_task.fis.features = features;
667 task->ata_task.fis.device = d2h_fis->device;
668 task->ata_task.retry_count = 1;
669
670 res = sas_execute_task(task, buffer, size, dma_dir);
671
672 sas_free_task(task);
673out:
674 return res;
675}
676
677#define ATA_IDENTIFY_DEV 0xEC
678#define ATA_IDENTIFY_PACKET_DEV 0xA1
679#define ATA_SET_FEATURES 0xEF
680#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
681
682/**
683 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
684 * @dev: STP/SATA device of interest (ATA/ATAPI)
685 *
686 * The LLDD has already been notified of this device, so that we can
687 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
688 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
689 * performance for this device.
690 */
691static int sas_discover_sata_dev(struct domain_device *dev)
692{
693 int res;
694 __le16 *identify_x;
695 u8 command;
696
697 identify_x = kzalloc(512, GFP_KERNEL);
698 if (!identify_x)
699 return -ENOMEM;
700
701 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
702 dev->sata_dev.identify_device = identify_x;
703 command = ATA_IDENTIFY_DEV;
704 } else {
705 dev->sata_dev.identify_packet_device = identify_x;
706 command = ATA_IDENTIFY_PACKET_DEV;
707 }
708
709 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
710 DMA_FROM_DEVICE);
711 if (res)
712 goto out_err;
713
714 /* lives on the media? */
715 if (le16_to_cpu(identify_x[0]) & 4) {
716 /* incomplete response */
717 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
718 "dev %llx\n", SAS_ADDR(dev->sas_addr));
719 if (!(identify_x[83] & cpu_to_le16(1<<6)))
720 goto cont1;
721 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
722 ATA_FEATURE_PUP_STBY_SPIN_UP,
723 NULL, 0, DMA_NONE);
724 if (res)
725 goto cont1;
726
727 schedule_timeout_interruptible(5*HZ); /* More time? */
728 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
729 DMA_FROM_DEVICE);
730 if (res)
731 goto out_err;
732 }
733cont1:
734 /* XXX Hint: register this SATA device with SATL.
735 When this returns, dev->sata_dev->lu is alive and
736 present.
737 sas_satl_register_dev(dev);
738 */
739
740 sas_fill_in_rphy(dev, dev->rphy);
741
742 return 0;
743out_err:
744 dev->sata_dev.identify_packet_device = NULL;
745 dev->sata_dev.identify_device = NULL;
746 kfree(identify_x);
747 return res;
748}
749
750static int sas_discover_sata_pm(struct domain_device *dev)
751{
752 return -ENODEV;
753}
754
755/**
756 * sas_discover_sata -- discover an STP/SATA domain device
757 * @dev: pointer to struct domain_device of interest
758 *
759 * First we notify the LLDD of this device, so we can send frames to
760 * it. Then depending on the type of device we call the appropriate
761 * discover functions. Once device discover is done, we notify the
762 * LLDD so that it can fine-tune its parameters for the device, by
763 * removing it and then adding it. That is, the second time around,
764 * the driver would have certain fields, that it is looking at, set.
765 * Finally we initialize the kobj so that the device can be added to
766 * the system at registration time. Devices directly attached to a HA
767 * port, have no parents. All other devices do, and should have their
768 * "parent" pointer set appropriately before calling this function.
769 */
770int sas_discover_sata(struct domain_device *dev)
771{
772 int res;
773
774 sas_get_ata_command_set(dev);
775
776 res = sas_notify_lldd_dev_found(dev);
777 if (res)
778 return res;
779
780 switch (dev->dev_type) {
781 case SATA_DEV:
782 res = sas_discover_sata_dev(dev);
783 break;
784 case SATA_PM:
785 res = sas_discover_sata_pm(dev);
786 break;
787 default:
788 break;
789 }
790 sas_notify_lldd_dev_gone(dev);
791 if (!res) {
792 sas_notify_lldd_dev_found(dev);
793 res = sas_rphy_add(dev->rphy);
794 }
795
796 return res;
797}
798
799void sas_ata_strategy_handler(struct Scsi_Host *shost)
800{
801 struct scsi_device *sdev;
802
803 shost_for_each_device(sdev, shost) {
804 struct domain_device *ddev = sdev_to_domain_dev(sdev);
805 struct ata_port *ap = ddev->sata_dev.ap;
806
807 if (!dev_is_sata(ddev))
808 continue;
809
810 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
811 ata_scsi_port_error_handler(shost, ap);
812 }
813}
814
815int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
816 enum blk_eh_timer_return *rtn)
817{
818 struct domain_device *ddev = cmd_to_domain_dev(cmd);
819
820 if (!dev_is_sata(ddev) || task)
821 return 0;
822
823 /* we're a sata device with no task, so this must be a libata
824 * eh timeout. Ideally should hook into libata timeout
825 * handling, but there's no point, it just wants to activate
826 * the eh thread */
827 *rtn = BLK_EH_NOT_HANDLED;
828 return 1;
829}
830
831int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
832 struct list_head *done_q)
833{
834 int rtn = 0;
835 struct scsi_cmnd *cmd, *n;
836 struct ata_port *ap;
837
838 do {
839 LIST_HEAD(sata_q);
840
841 ap = NULL;
842
843 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
844 struct domain_device *ddev = cmd_to_domain_dev(cmd);
845
846 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
847 continue;
848 if (ap && ap != ddev->sata_dev.ap)
849 continue;
850 ap = ddev->sata_dev.ap;
851 rtn = 1;
852 list_move(&cmd->eh_entry, &sata_q);
853 }
854
855 if (!list_empty(&sata_q)) {
856 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
857 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
858 /*
859 * ata's error handler may leave the cmd on the list
860 * so make sure they don't remain on a stack list
861 * about to go out of scope.
862 *
863 * This looks strange, since the commands are
864 * now part of no list, but the next error
865 * action will be ata_port_error_handler()
866 * which takes no list and sweeps them up
867 * anyway from the ata tag array.
868 */
869 while (!list_empty(&sata_q))
870 list_del_init(sata_q.next);
871 }
872 } while (ap);
873
874 return rtn;
875}
1/*
2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
3 *
4 * Copyright (C) 2006 IBM Corporation
5 *
6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 */
23
24#include <linux/scatterlist.h>
25#include <linux/slab.h>
26#include <linux/async.h>
27#include <linux/export.h>
28
29#include <scsi/sas_ata.h>
30#include "sas_internal.h"
31#include <scsi/scsi_host.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_tcq.h>
34#include <scsi/scsi.h>
35#include <scsi/scsi_transport.h>
36#include <scsi/scsi_transport_sas.h>
37#include "../scsi_sas_internal.h"
38#include "../scsi_transport_api.h"
39#include <scsi/scsi_eh.h>
40
41static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
42{
43 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
44
45 /* transport error */
46 if (ts->resp == SAS_TASK_UNDELIVERED)
47 return AC_ERR_ATA_BUS;
48
49 /* ts->resp == SAS_TASK_COMPLETE */
50 /* task delivered, what happened afterwards? */
51 switch (ts->stat) {
52 case SAS_DEV_NO_RESPONSE:
53 return AC_ERR_TIMEOUT;
54
55 case SAS_INTERRUPTED:
56 case SAS_PHY_DOWN:
57 case SAS_NAK_R_ERR:
58 return AC_ERR_ATA_BUS;
59
60
61 case SAS_DATA_UNDERRUN:
62 /*
63 * Some programs that use the taskfile interface
64 * (smartctl in particular) can cause underrun
65 * problems. Ignore these errors, perhaps at our
66 * peril.
67 */
68 return 0;
69
70 case SAS_DATA_OVERRUN:
71 case SAS_QUEUE_FULL:
72 case SAS_DEVICE_UNKNOWN:
73 case SAS_SG_ERR:
74 return AC_ERR_INVALID;
75
76 case SAS_OPEN_TO:
77 case SAS_OPEN_REJECT:
78 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
79 __func__, ts->stat);
80 return AC_ERR_OTHER;
81
82 case SAM_STAT_CHECK_CONDITION:
83 case SAS_ABORTED_TASK:
84 return AC_ERR_DEV;
85
86 case SAS_PROTO_RESPONSE:
87 /* This means the ending_fis has the error
88 * value; return 0 here to collect it */
89 return 0;
90 default:
91 return 0;
92 }
93}
94
95static void sas_ata_task_done(struct sas_task *task)
96{
97 struct ata_queued_cmd *qc = task->uldd_task;
98 struct domain_device *dev = task->dev;
99 struct task_status_struct *stat = &task->task_status;
100 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
101 struct sas_ha_struct *sas_ha = dev->port->ha;
102 enum ata_completion_errors ac;
103 unsigned long flags;
104 struct ata_link *link;
105 struct ata_port *ap;
106
107 spin_lock_irqsave(&dev->done_lock, flags);
108 if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
109 task = NULL;
110 else if (qc && qc->scsicmd)
111 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
112 spin_unlock_irqrestore(&dev->done_lock, flags);
113
114 /* check if libsas-eh got to the task before us */
115 if (unlikely(!task))
116 return;
117
118 if (!qc)
119 goto qc_already_gone;
120
121 ap = qc->ap;
122 link = &ap->link;
123
124 spin_lock_irqsave(ap->lock, flags);
125 /* check if we lost the race with libata/sas_ata_post_internal() */
126 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) {
127 spin_unlock_irqrestore(ap->lock, flags);
128 if (qc->scsicmd)
129 goto qc_already_gone;
130 else {
131 /* if eh is not involved and the port is frozen then the
132 * ata internal abort process has taken responsibility
133 * for this sas_task
134 */
135 return;
136 }
137 }
138
139 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
140 ((stat->stat == SAM_STAT_CHECK_CONDITION &&
141 dev->sata_dev.class == ATA_DEV_ATAPI))) {
142 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
143
144 if (!link->sactive) {
145 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
146 } else {
147 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
148 if (unlikely(link->eh_info.err_mask))
149 qc->flags |= ATA_QCFLAG_FAILED;
150 }
151 } else {
152 ac = sas_to_ata_err(stat);
153 if (ac) {
154 SAS_DPRINTK("%s: SAS error %x\n", __func__,
155 stat->stat);
156 /* We saw a SAS error. Send a vague error. */
157 if (!link->sactive) {
158 qc->err_mask = ac;
159 } else {
160 link->eh_info.err_mask |= AC_ERR_DEV;
161 qc->flags |= ATA_QCFLAG_FAILED;
162 }
163
164 dev->sata_dev.fis[3] = 0x04; /* status err */
165 dev->sata_dev.fis[2] = ATA_ERR;
166 }
167 }
168
169 qc->lldd_task = NULL;
170 ata_qc_complete(qc);
171 spin_unlock_irqrestore(ap->lock, flags);
172
173qc_already_gone:
174 sas_free_task(task);
175}
176
177static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
178{
179 unsigned long flags;
180 struct sas_task *task;
181 struct scatterlist *sg;
182 int ret = AC_ERR_SYSTEM;
183 unsigned int si, xfer = 0;
184 struct ata_port *ap = qc->ap;
185 struct domain_device *dev = ap->private_data;
186 struct sas_ha_struct *sas_ha = dev->port->ha;
187 struct Scsi_Host *host = sas_ha->core.shost;
188 struct sas_internal *i = to_sas_internal(host->transportt);
189
190 /* TODO: audit callers to ensure they are ready for qc_issue to
191 * unconditionally re-enable interrupts
192 */
193 local_irq_save(flags);
194 spin_unlock(ap->lock);
195
196 /* If the device fell off, no sense in issuing commands */
197 if (test_bit(SAS_DEV_GONE, &dev->state))
198 goto out;
199
200 task = sas_alloc_task(GFP_ATOMIC);
201 if (!task)
202 goto out;
203 task->dev = dev;
204 task->task_proto = SAS_PROTOCOL_STP;
205 task->task_done = sas_ata_task_done;
206
207 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
208 qc->tf.command == ATA_CMD_FPDMA_READ) {
209 /* Need to zero out the tag libata assigned us */
210 qc->tf.nsect = 0;
211 }
212
213 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
214 task->uldd_task = qc;
215 if (ata_is_atapi(qc->tf.protocol)) {
216 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
217 task->total_xfer_len = qc->nbytes;
218 task->num_scatter = qc->n_elem;
219 } else {
220 for_each_sg(qc->sg, sg, qc->n_elem, si)
221 xfer += sg->length;
222
223 task->total_xfer_len = xfer;
224 task->num_scatter = si;
225 }
226
227 task->data_dir = qc->dma_dir;
228 task->scatter = qc->sg;
229 task->ata_task.retry_count = 1;
230 task->task_state_flags = SAS_TASK_STATE_PENDING;
231 qc->lldd_task = task;
232
233 switch (qc->tf.protocol) {
234 case ATA_PROT_NCQ:
235 task->ata_task.use_ncq = 1;
236 /* fall through */
237 case ATAPI_PROT_DMA:
238 case ATA_PROT_DMA:
239 task->ata_task.dma_xfer = 1;
240 break;
241 }
242
243 if (qc->scsicmd)
244 ASSIGN_SAS_TASK(qc->scsicmd, task);
245
246 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
247 if (ret) {
248 SAS_DPRINTK("lldd_execute_task returned: %d\n", ret);
249
250 if (qc->scsicmd)
251 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
252 sas_free_task(task);
253 ret = AC_ERR_SYSTEM;
254 }
255
256 out:
257 spin_lock(ap->lock);
258 local_irq_restore(flags);
259 return ret;
260}
261
262static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
263{
264 struct domain_device *dev = qc->ap->private_data;
265
266 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
267 return true;
268}
269
270static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
271{
272 return to_sas_internal(dev->port->ha->core.shost->transportt);
273}
274
275static int sas_get_ata_command_set(struct domain_device *dev);
276
277int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
278{
279 if (phy->attached_tproto & SAS_PROTOCOL_STP)
280 dev->tproto = phy->attached_tproto;
281 if (phy->attached_sata_dev)
282 dev->tproto |= SAS_SATA_DEV;
283
284 if (phy->attached_dev_type == SAS_SATA_PENDING)
285 dev->dev_type = SAS_SATA_PENDING;
286 else {
287 int res;
288
289 dev->dev_type = SAS_SATA_DEV;
290 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
291 &dev->sata_dev.rps_resp);
292 if (res) {
293 SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
294 "0x%x\n", SAS_ADDR(dev->parent->sas_addr),
295 phy->phy_id, res);
296 return res;
297 }
298 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
299 sizeof(struct dev_to_host_fis));
300 dev->sata_dev.class = sas_get_ata_command_set(dev);
301 }
302 return 0;
303}
304
305static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
306{
307 int res;
308
309 /* we weren't pending, so successfully end the reset sequence now */
310 if (dev->dev_type != SAS_SATA_PENDING)
311 return 1;
312
313 /* hmmm, if this succeeds do we need to repost the domain_device to the
314 * lldd so it can pick up new parameters?
315 */
316 res = sas_get_ata_info(dev, phy);
317 if (res)
318 return 0; /* retry */
319 else
320 return 1;
321}
322
323static int smp_ata_check_ready(struct ata_link *link)
324{
325 int res;
326 struct ata_port *ap = link->ap;
327 struct domain_device *dev = ap->private_data;
328 struct domain_device *ex_dev = dev->parent;
329 struct sas_phy *phy = sas_get_local_phy(dev);
330 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
331
332 res = sas_ex_phy_discover(ex_dev, phy->number);
333 sas_put_local_phy(phy);
334
335 /* break the wait early if the expander is unreachable,
336 * otherwise keep polling
337 */
338 if (res == -ECOMM)
339 return res;
340 if (res != SMP_RESP_FUNC_ACC)
341 return 0;
342
343 switch (ex_phy->attached_dev_type) {
344 case SAS_SATA_PENDING:
345 return 0;
346 case SAS_END_DEVICE:
347 if (ex_phy->attached_sata_dev)
348 return sas_ata_clear_pending(dev, ex_phy);
349 default:
350 return -ENODEV;
351 }
352}
353
354static int local_ata_check_ready(struct ata_link *link)
355{
356 struct ata_port *ap = link->ap;
357 struct domain_device *dev = ap->private_data;
358 struct sas_internal *i = dev_to_sas_internal(dev);
359
360 if (i->dft->lldd_ata_check_ready)
361 return i->dft->lldd_ata_check_ready(dev);
362 else {
363 /* lldd's that don't implement 'ready' checking get the
364 * old default behavior of not coordinating reset
365 * recovery with libata
366 */
367 return 1;
368 }
369}
370
371static int sas_ata_printk(const char *level, const struct domain_device *ddev,
372 const char *fmt, ...)
373{
374 struct ata_port *ap = ddev->sata_dev.ap;
375 struct device *dev = &ddev->rphy->dev;
376 struct va_format vaf;
377 va_list args;
378 int r;
379
380 va_start(args, fmt);
381
382 vaf.fmt = fmt;
383 vaf.va = &args;
384
385 r = printk("%ssas: ata%u: %s: %pV",
386 level, ap->print_id, dev_name(dev), &vaf);
387
388 va_end(args);
389
390 return r;
391}
392
393static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
394 unsigned long deadline)
395{
396 int ret = 0, res;
397 struct sas_phy *phy;
398 struct ata_port *ap = link->ap;
399 int (*check_ready)(struct ata_link *link);
400 struct domain_device *dev = ap->private_data;
401 struct sas_internal *i = dev_to_sas_internal(dev);
402
403 res = i->dft->lldd_I_T_nexus_reset(dev);
404 if (res == -ENODEV)
405 return res;
406
407 if (res != TMF_RESP_FUNC_COMPLETE)
408 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
409
410 phy = sas_get_local_phy(dev);
411 if (scsi_is_sas_phy_local(phy))
412 check_ready = local_ata_check_ready;
413 else
414 check_ready = smp_ata_check_ready;
415 sas_put_local_phy(phy);
416
417 ret = ata_wait_after_reset(link, deadline, check_ready);
418 if (ret && ret != -EAGAIN)
419 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
420
421 *class = dev->sata_dev.class;
422
423 ap->cbl = ATA_CBL_SATA;
424 return ret;
425}
426
427/*
428 * notify the lldd to forget the sas_task for this internal ata command
429 * that bypasses scsi-eh
430 */
431static void sas_ata_internal_abort(struct sas_task *task)
432{
433 struct sas_internal *si = dev_to_sas_internal(task->dev);
434 unsigned long flags;
435 int res;
436
437 spin_lock_irqsave(&task->task_state_lock, flags);
438 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
439 task->task_state_flags & SAS_TASK_STATE_DONE) {
440 spin_unlock_irqrestore(&task->task_state_lock, flags);
441 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
442 task);
443 goto out;
444 }
445 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
446 spin_unlock_irqrestore(&task->task_state_lock, flags);
447
448 res = si->dft->lldd_abort_task(task);
449
450 spin_lock_irqsave(&task->task_state_lock, flags);
451 if (task->task_state_flags & SAS_TASK_STATE_DONE ||
452 res == TMF_RESP_FUNC_COMPLETE) {
453 spin_unlock_irqrestore(&task->task_state_lock, flags);
454 goto out;
455 }
456
457 /* XXX we are not prepared to deal with ->lldd_abort_task()
458 * failures. TODO: lldds need to unconditionally forget about
459 * aborted ata tasks, otherwise we (likely) leak the sas task
460 * here
461 */
462 SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task);
463
464 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
465 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
466 spin_unlock_irqrestore(&task->task_state_lock, flags);
467
468 return;
469 out:
470 sas_free_task(task);
471}
472
473static void sas_ata_post_internal(struct ata_queued_cmd *qc)
474{
475 if (qc->flags & ATA_QCFLAG_FAILED)
476 qc->err_mask |= AC_ERR_OTHER;
477
478 if (qc->err_mask) {
479 /*
480 * Find the sas_task and kill it. By this point, libata
481 * has decided to kill the qc and has frozen the port.
482 * In this state sas_ata_task_done() will no longer free
483 * the sas_task, so we need to notify the lldd (via
484 * ->lldd_abort_task) that the task is dead and free it
485 * ourselves.
486 */
487 struct sas_task *task = qc->lldd_task;
488
489 qc->lldd_task = NULL;
490 if (!task)
491 return;
492 task->uldd_task = NULL;
493 sas_ata_internal_abort(task);
494 }
495}
496
497
498static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
499{
500 struct domain_device *dev = ap->private_data;
501 struct sas_internal *i = dev_to_sas_internal(dev);
502
503 if (i->dft->lldd_ata_set_dmamode)
504 i->dft->lldd_ata_set_dmamode(dev);
505}
506
507static void sas_ata_sched_eh(struct ata_port *ap)
508{
509 struct domain_device *dev = ap->private_data;
510 struct sas_ha_struct *ha = dev->port->ha;
511 unsigned long flags;
512
513 spin_lock_irqsave(&ha->lock, flags);
514 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
515 ha->eh_active++;
516 ata_std_sched_eh(ap);
517 spin_unlock_irqrestore(&ha->lock, flags);
518}
519
520void sas_ata_end_eh(struct ata_port *ap)
521{
522 struct domain_device *dev = ap->private_data;
523 struct sas_ha_struct *ha = dev->port->ha;
524 unsigned long flags;
525
526 spin_lock_irqsave(&ha->lock, flags);
527 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
528 ha->eh_active--;
529 spin_unlock_irqrestore(&ha->lock, flags);
530}
531
532static struct ata_port_operations sas_sata_ops = {
533 .prereset = ata_std_prereset,
534 .hardreset = sas_ata_hard_reset,
535 .postreset = ata_std_postreset,
536 .error_handler = ata_std_error_handler,
537 .post_internal_cmd = sas_ata_post_internal,
538 .qc_defer = ata_std_qc_defer,
539 .qc_prep = ata_noop_qc_prep,
540 .qc_issue = sas_ata_qc_issue,
541 .qc_fill_rtf = sas_ata_qc_fill_rtf,
542 .port_start = ata_sas_port_start,
543 .port_stop = ata_sas_port_stop,
544 .set_dmamode = sas_ata_set_dmamode,
545 .sched_eh = sas_ata_sched_eh,
546 .end_eh = sas_ata_end_eh,
547};
548
549static struct ata_port_info sata_port_info = {
550 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
551 ATA_FLAG_SAS_HOST,
552 .pio_mask = ATA_PIO4,
553 .mwdma_mask = ATA_MWDMA2,
554 .udma_mask = ATA_UDMA6,
555 .port_ops = &sas_sata_ops
556};
557
558int sas_ata_init(struct domain_device *found_dev)
559{
560 struct sas_ha_struct *ha = found_dev->port->ha;
561 struct Scsi_Host *shost = ha->core.shost;
562 struct ata_port *ap;
563 int rc;
564
565 ata_host_init(&found_dev->sata_dev.ata_host, ha->dev, &sas_sata_ops);
566 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
567 &sata_port_info,
568 shost);
569 if (!ap) {
570 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
571 return -ENODEV;
572 }
573
574 ap->private_data = found_dev;
575 ap->cbl = ATA_CBL_SATA;
576 ap->scsi_host = shost;
577 rc = ata_sas_port_init(ap);
578 if (rc) {
579 ata_sas_port_destroy(ap);
580 return rc;
581 }
582 found_dev->sata_dev.ap = ap;
583
584 return 0;
585}
586
587void sas_ata_task_abort(struct sas_task *task)
588{
589 struct ata_queued_cmd *qc = task->uldd_task;
590 struct completion *waiting;
591
592 /* Bounce SCSI-initiated commands to the SCSI EH */
593 if (qc->scsicmd) {
594 struct request_queue *q = qc->scsicmd->device->request_queue;
595 unsigned long flags;
596
597 spin_lock_irqsave(q->queue_lock, flags);
598 blk_abort_request(qc->scsicmd->request);
599 spin_unlock_irqrestore(q->queue_lock, flags);
600 return;
601 }
602
603 /* Internal command, fake a timeout and complete. */
604 qc->flags &= ~ATA_QCFLAG_ACTIVE;
605 qc->flags |= ATA_QCFLAG_FAILED;
606 qc->err_mask |= AC_ERR_TIMEOUT;
607 waiting = qc->private_data;
608 complete(waiting);
609}
610
611static int sas_get_ata_command_set(struct domain_device *dev)
612{
613 struct dev_to_host_fis *fis =
614 (struct dev_to_host_fis *) dev->frame_rcvd;
615 struct ata_taskfile tf;
616
617 if (dev->dev_type == SAS_SATA_PENDING)
618 return ATA_DEV_UNKNOWN;
619
620 ata_tf_from_fis((const u8 *)fis, &tf);
621
622 return ata_dev_classify(&tf);
623}
624
625void sas_probe_sata(struct asd_sas_port *port)
626{
627 struct domain_device *dev, *n;
628
629 mutex_lock(&port->ha->disco_mutex);
630 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
631 if (!dev_is_sata(dev))
632 continue;
633
634 ata_sas_async_probe(dev->sata_dev.ap);
635 }
636 mutex_unlock(&port->ha->disco_mutex);
637
638 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
639 if (!dev_is_sata(dev))
640 continue;
641
642 sas_ata_wait_eh(dev);
643
644 /* if libata could not bring the link up, don't surface
645 * the device
646 */
647 if (ata_dev_disabled(sas_to_ata_dev(dev)))
648 sas_fail_probe(dev, __func__, -ENODEV);
649 }
650
651}
652
653static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
654{
655 struct domain_device *dev, *n;
656
657 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
658 if (!dev_is_sata(dev))
659 continue;
660
661 sas_ata_wait_eh(dev);
662
663 /* if libata failed to power manage the device, tear it down */
664 if (ata_dev_disabled(sas_to_ata_dev(dev)))
665 sas_fail_probe(dev, func, -ENODEV);
666 }
667}
668
669void sas_suspend_sata(struct asd_sas_port *port)
670{
671 struct domain_device *dev;
672
673 mutex_lock(&port->ha->disco_mutex);
674 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
675 struct sata_device *sata;
676
677 if (!dev_is_sata(dev))
678 continue;
679
680 sata = &dev->sata_dev;
681 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
682 continue;
683
684 ata_sas_port_suspend(sata->ap);
685 }
686 mutex_unlock(&port->ha->disco_mutex);
687
688 sas_ata_flush_pm_eh(port, __func__);
689}
690
691void sas_resume_sata(struct asd_sas_port *port)
692{
693 struct domain_device *dev;
694
695 mutex_lock(&port->ha->disco_mutex);
696 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
697 struct sata_device *sata;
698
699 if (!dev_is_sata(dev))
700 continue;
701
702 sata = &dev->sata_dev;
703 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
704 continue;
705
706 ata_sas_port_resume(sata->ap);
707 }
708 mutex_unlock(&port->ha->disco_mutex);
709
710 sas_ata_flush_pm_eh(port, __func__);
711}
712
713/**
714 * sas_discover_sata -- discover an STP/SATA domain device
715 * @dev: pointer to struct domain_device of interest
716 *
717 * Devices directly attached to a HA port, have no parents. All other
718 * devices do, and should have their "parent" pointer set appropriately
719 * before calling this function.
720 */
721int sas_discover_sata(struct domain_device *dev)
722{
723 int res;
724
725 if (dev->dev_type == SAS_SATA_PM)
726 return -ENODEV;
727
728 dev->sata_dev.class = sas_get_ata_command_set(dev);
729 sas_fill_in_rphy(dev, dev->rphy);
730
731 res = sas_notify_lldd_dev_found(dev);
732 if (res)
733 return res;
734
735 sas_discover_event(dev->port, DISCE_PROBE);
736 return 0;
737}
738
739static void async_sas_ata_eh(void *data, async_cookie_t cookie)
740{
741 struct domain_device *dev = data;
742 struct ata_port *ap = dev->sata_dev.ap;
743 struct sas_ha_struct *ha = dev->port->ha;
744
745 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
746 ata_scsi_port_error_handler(ha->core.shost, ap);
747 sas_put_device(dev);
748}
749
750void sas_ata_strategy_handler(struct Scsi_Host *shost)
751{
752 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
753 ASYNC_DOMAIN_EXCLUSIVE(async);
754 int i;
755
756 /* it's ok to defer revalidation events during ata eh, these
757 * disks are in one of three states:
758 * 1/ present for initial domain discovery, and these
759 * resets will cause bcn flutters
760 * 2/ hot removed, we'll discover that after eh fails
761 * 3/ hot added after initial discovery, lost the race, and need
762 * to catch the next train.
763 */
764 sas_disable_revalidation(sas_ha);
765
766 spin_lock_irq(&sas_ha->phy_port_lock);
767 for (i = 0; i < sas_ha->num_phys; i++) {
768 struct asd_sas_port *port = sas_ha->sas_port[i];
769 struct domain_device *dev;
770
771 spin_lock(&port->dev_list_lock);
772 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
773 if (!dev_is_sata(dev))
774 continue;
775
776 /* hold a reference over eh since we may be
777 * racing with final remove once all commands
778 * are completed
779 */
780 kref_get(&dev->kref);
781
782 async_schedule_domain(async_sas_ata_eh, dev, &async);
783 }
784 spin_unlock(&port->dev_list_lock);
785 }
786 spin_unlock_irq(&sas_ha->phy_port_lock);
787
788 async_synchronize_full_domain(&async);
789
790 sas_enable_revalidation(sas_ha);
791}
792
793void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
794 struct list_head *done_q)
795{
796 struct scsi_cmnd *cmd, *n;
797 struct domain_device *eh_dev;
798
799 do {
800 LIST_HEAD(sata_q);
801 eh_dev = NULL;
802
803 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
804 struct domain_device *ddev = cmd_to_domain_dev(cmd);
805
806 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
807 continue;
808 if (eh_dev && eh_dev != ddev)
809 continue;
810 eh_dev = ddev;
811 list_move(&cmd->eh_entry, &sata_q);
812 }
813
814 if (!list_empty(&sata_q)) {
815 struct ata_port *ap = eh_dev->sata_dev.ap;
816
817 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
818 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
819 /*
820 * ata's error handler may leave the cmd on the list
821 * so make sure they don't remain on a stack list
822 * about to go out of scope.
823 *
824 * This looks strange, since the commands are
825 * now part of no list, but the next error
826 * action will be ata_port_error_handler()
827 * which takes no list and sweeps them up
828 * anyway from the ata tag array.
829 */
830 while (!list_empty(&sata_q))
831 list_del_init(sata_q.next);
832 }
833 } while (eh_dev);
834}
835
836void sas_ata_schedule_reset(struct domain_device *dev)
837{
838 struct ata_eh_info *ehi;
839 struct ata_port *ap;
840 unsigned long flags;
841
842 if (!dev_is_sata(dev))
843 return;
844
845 ap = dev->sata_dev.ap;
846 ehi = &ap->link.eh_info;
847
848 spin_lock_irqsave(ap->lock, flags);
849 ehi->err_mask |= AC_ERR_TIMEOUT;
850 ehi->action |= ATA_EH_RESET;
851 ata_port_schedule_eh(ap);
852 spin_unlock_irqrestore(ap->lock, flags);
853}
854EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
855
856void sas_ata_wait_eh(struct domain_device *dev)
857{
858 struct ata_port *ap;
859
860 if (!dev_is_sata(dev))
861 return;
862
863 ap = dev->sata_dev.ap;
864 ata_port_wait_eh(ap);
865}